“…The knee pain, especially pain related to Patellofemoral Pain Syndrome, has a high prevalence in society, affecting mainly females in the ratio of two women for one man, with an incidence of approximately 11-14% of physically inactive population, 25-40% of the people practicing physical exercises, and 36% of cyclists (Collins et al, 2018;Crossley, Stefanik, et al, 2016;Crossley, Van Middelkoop, et al, 2016;Powers, Witvrouw, Davis, & Crossley, 2017;Smith et al, 2018;Van Middelkoop, Van Linschoten, Berger, Koes, & Bierma-Zeinstra, 2008;Wood, Muller, & Peat, 2011). In the present case study, there was a failure in the initial treatment (Gao, Zhong, & Wang, 2018;Porto, 2017;Porto & Porto, 2013;Rolf, 2007), making the patient stay two years with the same problem and with the prognosis getting worse. Considering the risk of poor prognosis in the treatment, the correct diagnosis is fundamental, in this case the wrong diagnosis has not permited the correct choice of therapeutic line.…”